Reductions in runoff for the buffer strips with different vegetation
Discharge data for all treatments spanning the entire monitoring period (2017-2020) are presented graphically in Figure 3 and summarised on an annual basis in Table 3. In the case of the grass buffer strip treatment, the reduction in runoff (Table 4) compared with the control, ranged from 5% (2018-2019) to 64% (2019-2020). The corresponding efficacy for the willow buffer strip treatment (Table 4) ranged from 25% (2018-2019) to 67% (2019-2020). For the deciduous woodland buffer strip treatment (Table 4), the reductions in runoff, compared with the control, ranged from 42% (2018-2019) to 52% (2019-2020). For the entire monitoring period (2017-2020; Table 4), reductions in runoff were in the descending order: willow buffer strips (49%) > deciduous woodland buffer strips (46%) > grass buffer strips (33%).